"In fact, even if Phytium decided to turn to China-based SMIC, the latter should obtain a special export license from the U.S. government to serve this CPU developer as it uses American technologies in chip production."
Except that SMIC has been already subjected to sanctions so vast and wide in scope that they have little-to-no incentive in collaborating with the enforcement of similar measures. This is the limit of sanctions that no one in the US appears to be willing to notice, when you've sanctioned someone too much, they have no incentive to collaborate with you any more. It doesn't matter whether it's a North Korean 152mm shell or SMIC's semi-modern quasi-7nm semiconductors.